61375645 has 4 divisors (see below), whose sum is σ = 73650780. Its totient is φ = 49100512.

The previous prime is 61375631. The next prime is 61375649. The reversal of 61375645 is 54657316.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13461561 + 47914084 = 3669^2 + 6922^2 .

It is a cyclic number.

It is not a de Polignac number, because 61375645 - 2²¹ = 59278493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61375649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6137560 + ... + 6137569.

It is an arithmetic number, because the mean of its divisors is an integer number (18412695).

Almost surely, 2^61375645 is an apocalyptic number.

It is an amenable number.

61375645 is a deficient number, since it is larger than the sum of its proper divisors (12275135).

61375645 is a wasteful number, since it uses less digits than its factorization.

61375645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12275134.

The product of its digits is 75600, while the sum is 37.

The square root of 61375645 is about 7834.2609734422. The cubic root of 61375645 is about 394.4561119930.

The spelling of 61375645 in words is "sixty-one million, three hundred seventy-five thousand, six hundred forty-five".